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We are using data domain (DD990's) back end for the TSM Servers here. (TSM 6.2.x) running on AIX.
We initially looked at setting them up as VTL's, but after talking with the EMC Reps we have gone simply using the DD as a target point for the backups..
we have 5 NFS mounts defined on the AIX box, that go to 2 containers on the data domain. TSM dev class set up -:
4 for data store, and one for the target for database backups ( and dev / vol config ) .

We have only had this running for about 2 months, but have had no issues with the volumes deleting /free'ing up space etc.

benifit so far, not having to worry about drive allocations etc in the VTL.
- we also still get the dedup of all the data, and the Datadomain back end replication to the DR site.
This eliminated the need for Fibre connection, we simple use the 10GbEthernet, with the 1GB for replication and management.

We're running TSM v6.2.3 on an AIX P7 box, I configured the SAN client to the DD box, created the drives, zoned te WWN, discovered the devices in AIX. Unfortunately I do not see the /dev/lb0 (Library). While looking in the DD box, I see the changer, however it has NO WWN.

1. What are you emulating? (I'm hearing NOW I have to emulate a TS3500 because I'm on a p7 instead of a p7
2. How do you discover the changer if option 1 is false?

Note all 200 drives have been mapped to he corresponding WWN and rmt #